The urbane smile of Frank Sullivan stretches across five decades, from the zany antics of Aunt Sarah Gallup in the 1920s to his final Christmas greeting poem for the New Yorker in 1974. Described by comic novelist P. G. Wodehouse as "America's finest humorist," Sullivan satirized, twitted, and otherwise entertained American readers for over fifty years with newspaper and magazine pieces, the best of which were collected in several volumes ranging from The Life and Times of Martha Hepplethwaite (1926) to Well, There's No Harm in Laughing (1972). Known in his later years as the Sage of Saratoga, Sullivan passed his youth as one of the most loved, albeit unassuming, members of the Algonquin Round Table, the group of writers and wits who gathered for luncheon conversation at the Hotel Algonquin in the 1920s. Along with such other Algonquin humorists as Franklin P. Adams, Robert Benchley, Dorothy Parker, Alexander Woollcott, and...